LibreNMS: Remote Code Execution by Signal Alert Transportation Module

{
  "id": "83c0f8c38731ea088e5d1ed2c0b1e61eaff50b66c256472b0317cae23f501af4",
  "url": "https://osv.dev/vulnerability/CVE-2026-55182",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "LibreNMS: Remote Code Execution by Signal Alert Transportation Module",
    "summary": "LibreNMS is a network monitoring system. In versions from 21.6.0 up to 26.5.0, the Signal alert transport is vulnerable to command injection because the signal-cli path and the Recipient field of an alert transport entry are insufficiently escaped before being passed to an exec call. An authenticated administrator can craft a transport entry whose Recipient contains shell metacharacters and whose path points to the bundled composer_wrapper.php script, which itself passes attacker-controlled input to further unsafe exec calls. By chaining these calls, the administrator can execute arbitrary operating-system commands on the LibreNMS host. This issue is fixed in version 26.5.0.",
    "evidence": "osv:CVE-2026-55182",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-55182",
      "aliases": [
        "CVE-2026-55182",
        "GHSA-c9fv-cgmm-2wg7"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/librenms/librenms",
              "type": "GIT",
              "events": [
                {
                  "introduced": "fb2608ee3dafbaaeba51421fed1d221218699c39"
                },
                {
                  "fixed": "403fa2ddf262d4cbd7e1748ed7678468cc7248d1"
                },
                {
                  "fixed": "868e3b966a"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "21.6.0"
                      },
                      {
                        "fixed": "26.5.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "868e3b966a"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "403fa2ddf262d4cbd7e1748ed7678468cc7248d1"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "26.5.0"
                  }
                ]
              }
            }
          ],
          "versions": [
            "26.4.1",
            "26.4.0",
            "26.3.1",
            "26.3.0",
            "26.2.0",
            "26.1.0",
            "25.12.0",
            "25.11.0",
            "25.10.0",
            "25.9.0",
            "25.8.0",
            "25.7.0",
            "25.6.0",
            "25.5.0",
            "25.4.0",
            "25.3.0",
            "25.2.0",
            "25.1.0",
            "24.12.0",
            "24.11.0",
            "24.10.1",
            "24.10.0",
            "24.9.1",
            "24.9.0",
            "24.8.0",
            "24.7.0",
            "24.6.0",
            "24.5.0",
            "24.4.1",
            "24.4.0",
            "24.3.0",
            "24.2.0",
            "24.1.0",
            "23.11.0",
            "23.10.0",
            "23.9.1",
            "23.9.0",
            "23.8.2",
            "23.8.1",
            "23.8.0",
            "23.7.0",
            "23.6.0",
            "23.5.0",
            "23.4.1",
            "23.4.0",
            "23.2.0",
            "23.1.0",
            "22.12.0",
            "22.11.0",
            "22.10.0",
            "22.9.0",
            "22.8.0",
            "22.7.0",
            "22.6.0",
            "22.5.0",
            "22.4.0",
            "22.3.0",
            "22.2.1",
            "22.2.0",
            "22.1.0",
            "21.12.1",
            "21.12.0",
            "21.11.0",
            "21.10.0",
            "21.9.0",
            "21.8.0",
            "21.7.0",
            "21.6.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55182.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:48.540441066Z",
      "provider": "osv",
      "references": [
        "https://github.com/librenms/librenms/releases/tag/26.5.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55182.json",
        "https://github.com/librenms/librenms/security/advisories/GHSA-c9fv-cgmm-2wg7",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-55182",
        "https://github.com/librenms/librenms/commit/868e3b966a"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-77"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55182.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-55182",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517020,
  "published_at": "2026-08-26T21:50:04.014+00:00"
}